How firm is your stability ball?

[mklap1]

When I press down on my stability there is quite an indent. I sort of sink into it on any exercise on my back. I'm thinking it needs to be inflated but how much? How can you tell?

 

[amyg]

I have DH look when I sit to see if my deflation rate looks similar to what is shown on screen or when I'm on it I look to see if my knee and thigh look to be at the same angle as demonstrated.

Sounds to me like yours is deflating and could use some more air!

 

[LaughingWater]

I agree ~ I think you need to inflate it more.

Mine is firm enough to actually be a bit uncomfortable on my chest when I'm face down on it. I like it that way because it rolls so much better.

 

[workingToBeFit]

I actually measure mine to see if they are the size they are stated to be - I've got a 55 cm and a 65 cm. Using a tape measure or yardstick it's pretty easy to do. They are very firm this way, I only get a little indent from either one.

 

[nkhansen1]

The proper circumference for a 55 cm ball is 173 cm. You have to find the circumference of a sphere to get the right inflation. If you have a ball bigger than 55 cm, just do a google search for a circumference formula calculator, then plug in your ball's circumference. The calculator will do the rest.

 

[workingToBeFit]

easy to calculate circumference yourself, if you want to

It's simple to calculate the circumference yourself with any calculator. The formula is 2 * PI * radius. So for 55 cm this is 55 * 3.14159 (using a common approximation of PI; also the diameter of 55 is equal to 2 * radius).

Anyway we just measure the diameter with a yardstick and it works nicely. We find this a lot easier than trying to measure the circumference.

 

[josiespcah6ojsh]

i had the same problem.i used an electrical pump that is used for a mattress. test it with your hands

laura

 

[gettingfitmom]

I heard somewhere that when you sit on the ball, your knees should be in line w/ your hips...